Hi
Please take a look at the following revisions. They should solve the problem. You need to move from the first page to the second page to see the Back button on the second page.
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</head>
<body>
<div data-role="page" id="wichtiges" data-theme="a" data-add-back-btn="true" data-back-btn-text="Back"> <!-- ### Place the attributes in the page div ### -->
<div data-role="header" data-theme="a"><h1>Wichtiges</h1></div>
<div data-role="content" id="wichtigescontent"> <!-- ### Make sure IDs are unique ### -->
<div class="content-primary">
<p>wichtiges</p>
<p><a href="#events">Go To Events</a></p>
</div> <!-- Content-Primary -->
</div> <!-- Content -->
</div> <!-- ### Missing Page div closure ### -->
<div data-role="page" id="events" data-theme="a" data-add-back-btn="true" data-back-btn-text="Back"> <!-- ### Place the attributes in the page div ### -->
<div data-role="header" data-theme="a"><h1>Events</h1></div>
<div data-role="content" id="eventscontent"> <!-- ### Make sure IDs are unique ### -->
<div class="content-primary">
<p>Events</p>
</div> <!-- Content-Primary -->
</div> <!-- Content -->
</div> <!-- ### Missing Page div closure ### -->
</body>
</html>
Velad